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| Macintosh 128k keeps restarting |
Posted by: Mac128k on 2021-01-14 19:00:54
Hello everyone I have a Macintosh 128k with a 240v analogue board that keeps restarting after running it for about 10 minutes but it mainly does it when the speaker is in use like when playing a game or something. I think it has something to do with the flyback as a failed one can cause speaker interference but I have never heard of a flyback restarting the machine though could this be something else causing it or just the flyback. And just to clarify I have tested 3 different motherboards that work fine with other machines and they do the exact same thing so it has nothing to do with the motherboard.
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Posted by: bibilit on 2021-01-14 20:41:23
Analog board issue, probably struggling to get to the right voltage and rebooting (when the floppy is in action)
Can be a problem with the Optoisolator, which is part of the regulation side.
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Posted by: Mac128k on 2021-01-14 21:09:10
Thanks I also just turned it on with the lights off and the flyback has cracked as I can see the blue arc I have seen people use electronic silicone to repair the cracks on flybacks does this actually work properly.
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Posted by: joshc on 2021-01-15 03:48:30
I would say at this stage you should seek a replacement flyback, the best place to find one is from a spare analog board - they come up on eBay now and again.
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Posted by: Mac128k on 2021-01-15 04:07:08
I do have an old flyback transformer on a blown up 120v 128k analogue board that was given to me by a mate but the analogue board that is in my 128k is a 1986 240v replacement one as I think the original must have fried out and had to be changed out. Its just a matter of weather a flyback from 120v board will work on a 240v one.
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Posted by: Mac128k on 2021-01-15 07:57:49
What's the best replacement for the optoisolator as I have looked around and replacement part numbers can differ.
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